I have same issue as Stephen, no way I can resize nor access example field I just see a small line. Probably because I changed application default font or something (I am on linux, gnome if that matters)

* Highlight the regex above ie. s[a-z]….. (excluding the quotes)
* Hit Alt-Enter and inject the RegExp language against that regexp.
* Highlight that same regexp above (excluding the open and close
quotes)
* Right click and select Check RegExp.
* You should now see the popup against which you check your regexps.
It’s truly a beautiful thing.

Kudos a hundred times over to Dmitry and the JetBrains team. Brilliant job and extremely usable.